问题 不定项选择题

学习化学会遇到一些与“相等”有关的规律,下列有关“相等”的说法中不正确的是[ ]

A、微粒中的质子总数和电子总数一定相等

B、溶液稀释前后,溶质的质量一定相等

C、化合物中正化合价代数和与负价代数和一定相等

D、物质发生化学变化前后,元素的种类数一定相等

答案

答案:A

完形填空

阅读下面短文,从短文后所给的四个选项(A,B,C和D)中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。

It was one of the hottest days of the dry season. We had not seen  36  for almost a month. The crops were dying. Every day, my husband  37  to get water to the fields. But  38  we saw some rain soon, we would lose everything.

However, one day I learned the true lesson of  39  and witnessed the only miracle I had  40  seen before. I was cooking in the kitchen when I saw my son, Billy,  41  toward the woods. He was walking  42  with effort, trying to be as still as possible. Minutes after he disappeared into the  43 , he came running back. I went on cooking, 44  that whatever he had been doing was finished. Moments later,  45 , he was once again walking slowly toward the woods. This activity went on for an hour. Finally I couldn’t help  46  him and saw the most amazing  47 .

Several large deer stood in front of him. Billy walked right up to them. I  48  screamed(尖叫) for him to get away, because a huge deer was dangerously  49  to him at that time. But the deer didn’t even move as Billy knelt down(跪下). I saw a tiny  50  lying on the ground, obviously suffering from  51 , lifting its head to drink the water cupped in Billy’s hands. When the water was  52 , Billy ran back to get more. It then became quite  53  to me what my son was doing.

I stood there, watching my  54  boy working so hard to save another life. As my tears began to hit the ground, they were suddenly joined by other drops. I looked up at the sky. It was as if God himself was weeping with pride. The rain that day 55 our farm.

36. A. water               B. rain             C. cloud           D. storm

37. A. decided           B. chose           C. tried            D. offered

38. A. before            B. if                  C. until           D. unless

39. A. sending          B. sharing          C. forgiving        D. begging

40. A. ever             B. never           C. once              D. yet

41. A. running                                         B. jumping         C. walking               D. riding

42. A. slowly                                          B. quickly          C. hurriedly              D. dangerously

43. A. plants           B. flowers          C. vegetables       D. woods

44. A. thinking         B. wondering       C. worrying        D. dreaming

45. A. though           B. besides          C. however           D. too

46. A. beating          B. following       C. teaching           D. hoping

47. A. sign             B. field             C. world           D. scene

48. A. almost           B. already          C. just              D. even

49. A. weak            B. ill               C. close            D. brave

50. A. horse                                           B. crop               C. baby              D. deer

51. A. thirst            B. diseases           C. heat             D. pain

52. A. lost             B. cleaned           C. gone            D. dried

53. A. comfortable                                     B. clear               C. acceptable         D. simple

54. A. kind                                           B. clever              C. naughty          D. honest

55. A. hit              B. washed            C. ruined           D. saved

单项选择题